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Vacuum Flush Power Steering?

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Old Oct 11, 2020 | 06:57 AM
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Default Vacuum Flush Power Steering?

I was wondering, can I just put a vacuum pump on the P/S return line, plug the reservoir, and suck the fluid out of the return line like bleeding brakes?
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Old Oct 12, 2020 | 09:18 AM
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No, that won't get air out of the entire system - but there is an easier way.

Jack both front wheels off the ground and turn the steering wheel lock-to-lock with the engine off. This action tuns the steering rack into a manual pump where it sucks in clear fluid from the tank and pumps out the old (with any air bubbles) back up the return line.

^ If you want to flush the system, suck the fluid out of the tank with a turkey baster or ear wax cleaning bulb. Then unhook the return line and run it into a jug. Get a small piece of tubing and hook it up to the return nipple on the tank and tape the tube up so fluid stays in the reservoir. Fill with clean fluid and then perform the procedure above until fluid runs clear through the system. Drain the tank, hook up the hoses, fill, and then perform the procedure one more time to get rid of any air bubbles introduced by the final draining of the reservoir.

F-Bodies are very sensitive to dirty P/S fluid, so its important to flush. I recommend at least every 75K miles to prevent the tank from boiling over.
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Old Oct 12, 2020 | 08:10 PM
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Thank you, I should have been more clear - I'm actually looking to flush the system, not bleed it. Just got an '02 that needs some love, and I'm working my way through fluid. Oil and Coolant are done, and power steering is next. I've read about having 2 other people to help flush with the engine on, but that seems complicated and risky to introducing air. I started trying the method of sucking out the steering fluid, replacing and driving around the block, then repeating, until it is clear, but after 3 cycles with no change in the fluid color, I'm looking for other options.

I'll try lifting the front end and turning the wheel with the engine off, that sounds like what I'm looking for.
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Old Oct 18, 2020 | 01:41 AM
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Originally Posted by cbrenthus
I was wondering, can I just put a vacuum pump on the P/S return line, plug the reservoir, and suck the fluid out of the return line like bleeding brakes?
Best way to clean the entire system.

https://ls1tech.com/forums/general-m...l#post15558910
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Old Oct 18, 2020 | 09:57 PM
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Originally Posted by stilealive
Best way to clean the entire system.

https://ls1tech.com/forums/general-m...l#post15558910
Nope. See Post #2. Since this was done, we've learned that it's not necessary to turn on the engine during this procedure. It makes everything a lot more controlled and lowers the heart rate enough to save at least 7 months on your lifetime.
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Old Oct 19, 2020 | 07:14 AM
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Originally Posted by wssix99
Nope. See Post #2. Since this was done, we've learned that it's not necessary to turn on the engine during this procedure. It makes everything a lot more controlled and lowers the heart rate enough to save at least 7 months on your lifetime.
I think thats a joke way to do it....but you have fun wiith that turkey baster....LOL And YOU wrote post #2....does that automatically give it more credibilty.....lol....?

Go read the link in post #4......

I like the engine running so the pump is creating pressure and cleaning out the old fluid MUCH BETTER than a ridiculous turkey baster that absolutely cannot get it all out.......

Now you tell us all why the pump running with real pressure actually doesn't work better than your turkey baster or your ear wax cleaner........LOL

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Old Oct 19, 2020 | 08:54 AM
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Originally Posted by stilealive
I think thats a joke way to do it....but you have fun wiith that turkey baster....LOL And YOU wrote post #2....does that automatically give it more credibilty.....lol....?
My impeccable reading and language skills builds my credibility. Read the whole post again carefully and you'll see that I am suggesting to use a bulb to suck out the fluid before disconnecting the return line. This avoids making a mess or spilling unsightly oil on the engine or on the floor. (I am not describing or recommending the old "turkey baster" method of doing this by diluting the fluid.)

It makes no difference if the engine is on or off. With the engine off, the rack works as the pump. Its very basic hydraulics. The same fluid will be moved through the system, irregardless of the pressure. The only real differences are that running the engine greatly increases the chance that the p/s pump will run dry and be damaged. The faster process with the engine running also wastes more clean fluid.


Last edited by wssix99; Oct 20, 2020 at 07:24 AM.
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